Dbier and tee combination thereof with drying oils



Patented Oct. 2, 1928.

UNITED STATES 1,686,484 PATENT OFFICE.

HYYM E. BUG, OF ROSELLE, NEW JERSEY, ASSIGNOR TO STANDARD OIL DEVELOP- IMENT COMPANY, A CORPORATION OF DELAWARE.

DRIER AND THE COMBINATION THEREOF WITH DRYING OILS.

No Drawing.

- This invention relates to driers comprisin the lead salt of an oilsoluble sulphomc acid and the combination thereof with drying oils.

When petroleum distillates and particularly lubricating distillates aretreated with fuming sulphuric acid or sulphuric anhydride, certain acidsareformed and are found in the oil phase at the expiration of thetreatment. These acids are characterized by the presence of sulphur incombination and are predominantly oil soluble.

For the purposes of this application they are termed oil solublesulphonic acids and the metallic derivatives thereof oil solublesulphonates. These acids are ordinarily neutralized to form oil solublesodium sulphonate and extracted from the oil phase by the use of aselectivesolvent such as a mixture of alcohol and water. After theextraction and separation of the solvent contaming dissolved sulphonate,the same is heated to distill off the solvent, leaving a residue ofcrude oil soluble sodium sulphonate together with some petroleum oil.

In accordance, with my method, I preferably remove any oil whichaccompanies the sulphonate by dissolving the crude material in anaqueous alcoholic solution, preferably containing 35 to 65% by weight ofalcohol and thereafter contacting the solution so made with a smallproportion of gasoline, say one-tenth to one-fifth of the total volume.A number of such extractions with gasoline may be employed successivelyalthough I usually employ from four to six. The oil migrates selectivelyinto the gasoline phase, leaving an alcoholic solution of sodiumsulphonate relatively free of oil.

The sodium sulphonate is then recovered from solution by evaporation ofthe solvent and is dissolved in water'to be converted into leadsulphonate by the usual metathetical reactions. I preferably dissolvethe sodium, sulphonate in waterto form a .dilute solution thereof, viz,one containing 5% or less of sodium sulphonate. Lead acetate or nitrateis then gradually added to the solution with continuous stirring untilprecipitation ceases. The crude lead sulphonate so precipitated containsentrained moisture and some unconverted sodium sulphonate. The entrainedmoisture isprefera 1y removed by the use of the centrifuge or similarmeans.

The lead sulphonate is then a itated with water and if 65 itdlsintegrates, lea acetate or nitrate solu- Application filed September16, 1927. Serial No. 220,060.

tion is again gradually added in amounts sufficient to produce completecoagulation. This washingand coagulation may be repeated a number oftimes if necessary until the lead sulphonate is relatively free ofsodium sulphonate and no longer disintegrates when agitated with water.

The lead sulphonate so produced is then I dissolved in an organicsolvent in which inorganic material is insoluble. The sulphonate issoluble in ethyl, methyl, or isopropyl alcohol, benzol, or a mixturecomprising these solvents in any proportion. I preferably employ amixture of benzol with ethyl or isopropyl alcohol of 75% or greatergravimetric concentration. After solution settling and/or filtration,the solvent .s evaporated to leave a residue of puri- I fied dry oilsoluble lead sulphonate.

The lead sulphonate so obtained is then combined witha drying oiltowhich pigments, resins,-and/or diluents may be added. I preferablyintroduce from to 1% of lead sulphonate based on the total weight of thepaint or varnish. The lead sulphonate functions as a drier and in thisway aints and varnishes of excellent drying c aracteristics may be moreeconomically manufactured than was previously possible. The leadsulphonate may of course be used in combination with other driers ifdesired.

The foregoing description of my method is in illustration and variousalternative compositions may be adopted within the scope of the appendedclaims in which it is my intention to claim broadly all novelty inherentin the invention.

. I claim:

1. A composition of matter comprising adrying oil and the'lead salt ofan oil soluble sulphonic acid derived from the treatment of petroleumoils with fuming sulphuric acid or sulphuric anhydride.

2. A paint or varnish comprising the lead HYYM E. BUG.

